XCL205/XCL206/XCL207 Series
ETR2801-014
Inductor Built-in Step-Down “micro DC/DC” Converters
☆GreenOperation Compatible
■GENERAL DESCRIPTION
The XCL205/XCL206/XCL207 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a
control IC in one tiny package (2.5mm×2.0mm, H=1.0mm). A stable power supply with an output current of 600mA is
configured using only two capacitors connected externally.
Operating voltage range is from 2.0V to 6.0V(XCL20xG:1.8V～6.0V). Output voltage is internally set in a range from 0.8V to
4.0V in increments of 0.05V. The device is operated by 3.0MHz, and includes 0.42ΩP-channel driver transistor and 0.52Ω
N-channel switching transistor. As for operation mode, the XCL205 series is PWM control, the XCL206 series is automatic
PWM/PFM switching control and the XCL207 series can be manually switched between the PWM control mode and the
automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of loads
(from light load to heavy load). During stand-by, the device is shutdown to reduce current consumption to as low as 1.0μA or
less. With the built-in UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage
becomes 1.4V or lower. XCL205B(G,F)/XCL206B(G,F)/XCL207B(G,F) series provide short-time turn-on by the soft start
function internally set in 0.25 ms (TYP). XCL205B(C,G,F) /XCL206 B(C,G,F) / XCL207B(C,G,F) integrate CL auto discharge
function which enables the electric charge stored at the output capacitor CL to be discharged via the internal auto-discharge
switch located between the LX and VSS pins. When the devices enter stand-by mode, output voltage quickly returns to the VSS
level as a result of this function.
■FEATURES
■APPLICATIONS
Ultra Small
Input Voltage
●Mobile phones, Smart phones
●Bluetooth Headsets
Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Capacitor
CE Function
●WiMAX PDAs, MIDs, UMPCs
●Portable game consoles
●Digital cameras, Camcorders
●Electronic dictionaries
Protection Circuits
Control Methods
Operating Ambient Temperature
Environmentally Friendly
■TYPICAL APPLICATION CIRCUIT
XCL205/206/207 Series A/B/C/G Types
: 2.5mm×2.0mm, H=1.0mm
: 2.0V ~ 6.0V(A/B/C Type)
1.8V ~ 6.0V(G/F Type)
: 0.8V ~ 4.0V (+2.0%)
: 90% (VIN=4.2V, VOUT=3.3V)
: 600mA
: 3.0MHz (+15%)
: 100%
: Low ESR Ceramic
: Active High
Soft-Start Circuit Built-In
CL High Speed Auto Discharge
:Current Limiter Circuit Built-In
(Constant Current & Latching)
: PWM (XCL205)
PWM/PFM Auto (XCL206)
PWM/PFM Manual (XCL207)
: -40℃～+85℃
: EU RoHS Compliant, Pb Free
■TYPICAL PERFORMANCE
CHARACTERISTICS
XCL205A333xx/XCL206A333xx/XCL207A333xx
100
L1
LX
80
VIN
Vss
Vss
VOUT
CIN
4.7μF
CE/MODE
600mA
L2
Efficency:EFFI(%)
CL
10μF
XCL206/XCL207(PWM/PFM)
60
VIN= 5.5V
5.0V
4.2V
40
XCL205/XCL207
(PWM)
20
VOUT=3.3V
(TOP VIEW)
* “L1 and LX”, and “L2 and VOUT” is connected by wiring.
0
0.1
1
10
100
1000
Output Current:IOUT (mA)
1/27
